A delightful little nightmare, and also the exact kind of difficulty spike I needed from Rimworld.

Dragon's Dogma 2 being a bit shit admittedly took a bit of the wind from my sails, giving me a hefty case of Gamer Block™ that's inhibited any attempts I make to start something new. Which is a shame, because I really want to play Library of Ruina.

Fortunately, for whatever reason, the games industry has collectively decided that April is update/DLC season, so every game I play on the side is shoveling new stuff down my throat. Between Dwarf Fortress, Ultrakill, Big Ambitions, CK3, an upcoming Total Warhammer 3 DLC and other stuff I'm probably forgetting, I'm hardly lacking in games to revisit.

But it's Rimworld's Anomaly expansion that's grabbed my attention the most.

I really like Rimworld. No matter what, I always come back and roll a new colony eventually. Compared to most colony sims, Rimworld manages to be an enjoyable experience even with very few colonists, and I'm eternally surprised at just how differently a lot of my colonies play out based on a combination of the colonists/map/terrain/storyteller.

But, sad as I am to say, once you've adjusted to Rimworld's particular eccentricities, it becomes rather easy. Each DLC can alleviate this in some way, but they don't offer much challenge beyond "mood debuffs" or "alternative humanoids to fight" on the difficulty front - even if their other offerings still make them worthwhile.

Anomaly, then, was much needed.

Somewhat uniquely for a Rimworld DLC, Anomaly does not initially fire when enabled. Besides an odd Monolith on the starting cell, some of the DLC gear appearing at vendors and the odd single Shambler (zombie), there are no real signs Anomaly has even enabled itself.
It's not until your curiosity gets the better of you, and the investigation of the Monolith starts, that Anomaly kicks in.

Anomaly's primary offering is in both difficulty and difficulty variety.

A single enemy stalking your base doesn't seem threatening, but it's invisible. Even a proximity detector only tells you it's hanging around, it won't show itself until it decloaks. It's smart, too! If you have pawns that work in separate areas away from one another it will absolutely wait until they're alone before decloaking and feasting.
Even then, there's a similar monster - the Revenant - that only comes out at night and snatches pawns away without picking a fight. For once, building separate bedrooms is no longer the safest option.

And sure, Rimworld has had events that boil down to "lots of things come to kill you" before, but Shamblers are uniquely terrifying in their volume. They also don't feel pain or suffer from organ damage, and while fire is effective against them it's also risky - wildfires are a very real threat, and if they breach your defensive lines it could be parts of the whole colony that go up in smoke.

There are lots of horrors in Anomaly, I won't go through all of them because some are best experienced blind, but my favourite is the Metalhorror which is... The Thing. Yes, that Thing. It slips into one of your pawns and goes out of its way to spread, and it is horrifically clever. If it infects a pawn on kitchen duty it'll slip food into the colony's meals. Infected doctors/surgeons will lie about examination results. Did you build a communal barracks to deal with the Revenant? Congratulationss! That's an infection vector!

Most basegame threats in Rimworld are easily subdued by catch-all solutions, which is was a huge contributing factor in the game being relatively easy even on naked brutality starts. Anomaly's threats not only require more specific countermeasures, but the threats you even receive are entirely randomized. There are no pre-prepare easy tactics, my friend.

Your reward for engaging with this threats is the ability to play Lobotomy Corporation, or Diet SCP. Unlike human prisoners, extradimensional horrors require much more intense containment measures in exchange for much grander rewards. Bioferrite is plucked from said horrors and makes for an excellent crafting material, and archeotech shards help turn pesky uncooperative prisoners into mindless Ghouls that regenerate all ailments/wounds absurdly fast and have no needs beyond raw meat - give them a Nuclear Stomach, and even that one need is moot. Take part in some dark rituals, and you can make colonists immortal by sapping the lifespan from an unwilling victim, or even warp a random person through the void to your colony for whatever nefarious reasons.

Despite writing 'reviews', I actually don't ever go out of my way to formally recommend things. I'm a glorified blogger yelling to myself, not a buyer's guide, I don't know your history or preferenes or exact mechanical icks or tolerance for girl guro.
That said, I don't recommend Anomaly as anyone's first Rimworld expansion. Not because of it's quality, no, but because it synergizes so well with Biotech (Sanguophages especially) and Ideology that it should come with a warning on the store page. Anomaly is phenomenal for 'evil' or unscrupulous colonies, and it adds so much to vampiric runs that I can't imagine one without all it adds.
Also, as a little post-gdocs addendum: Mechanitors feel infinitely more useful in Anomaly, in part due to robots lacking consciousness which makes them immune to the very concept of horror - and very resistant to Shamblers!

Lastly, if you're a prospective Rimworld buyer: Don't get Anomaly immediately. Or, if you do, don't fuck with monoliths. This is a hard DLC even for experienced Rimworld players, and it can feel 'unfair' at times. It's best bought once you're familiar with how Rimworld works, what makes a good colony, and how to handle disaster.

Ultimately, my only gripe with Anomaly isn't even a dealbreaker. Without touching the Monolith, Anomaly just doesn't activate. I would've liked to see toned-down versions of the various horrors appear as random events, but I can understand why given the ease with which they'd decimate newer players.

I don't really have a cool sendoff for this. You guys play uh, Balatro?

EDIT: Literally as soon as I posted this, Ludeon announced they were changing how Anomaly integrates. Amazing.